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Archival, demographic and genetic studies define a Sardinian sub-isolate as a suitable model for mapping complex traits

Angius, Andrea and Melis, Paola Maria and Morelli, Laura Cornelia Clotilde and Petretto, Enrico and Casu, Giuseppina and Maestrale, Giovanni Battista and Fraumene, Cristina and Bebbere, Daniela and Forabosco, Paola and Pirastu, Mario (2001) Archival, demographic and genetic studies define a Sardinian sub-isolate as a suitable model for mapping complex traits. Human Genetics, Vol. 109 (2), p. 198-209. eISSN 1432-1203. Article.

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DOI: 10.1007/s004390100557

Abstract

Genetic isolates represent exceptional resources for the mapping of complex traits but not all isolates are similar. We have selected a genetic and cultural isolate, the village of Talana from an isolated area of Sardinia, and propose that this population is suitable for the mapping of complex traits. A wealth of historical and archive data allowed the reconstruction of the demographic and genealogical history of the village. Key features of the population, which has grown slowly with no significant immigration, were defined by using a combination of historical, demographic and genetic studies. The genealogy of each Talana inhabitant was reconstructed and the main maternal and paternal lineages of the village were defined. Haplotype and phylogenetic analyses of the Y chromosome and characterisation of mitochondrial DNA haplogroups were used to determine the number of ancestral village founders. The extent of linkage disequilibrium (LD) was evaluated by the analysis of several microsatellites in chromosomal region Xq13.3, which was previously used to asses the extension of LD. Genealogical reconstructions were confirmed and reinforced by the genetic analyses, since some lineages were found to have merged prior to the beginning of the archival records, suggesting an even smaller number of founders than initially predicted. About 80% of the present-day population appears to derive from eight paternal and eleven maternal ancestral lineages. LD was found to span, on average, a 5-Mb region in Xq13.3. This suggests the possibility of identifying identical-by-descent regions associated with complex traits in a genome-wide search by using a low-density marker map. The present study emphasises the importance of combining genetic studies with genealogical and historical information.

Item Type:Article
ID Code:3970
Status:Published
Refereed:Yes
Uncontrolled Keywords:Genetics, genealogy, Sardinian population
Subjects:Area 07 - Scienze agrarie e veterinarie > VET/10 Clinica ostetrica e ginecologia veterinaria
Area 05 - Scienze biologiche > BIO/18 Genetica
Divisions:001 Università di Sassari > 01 Dipartimenti > Patologia e clinica veterinaria
001 Università di Sassari > 01 Dipartimenti > Zoologia e genetica evoluzionistica
002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di genetica delle popolazioni, Alghero
Publisher:Springer Berlin / Heidelberg
eISSN:1432-1203
Deposited On:26 May 2010 13:35

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